Optical Instrument Lens

Features

Specifications

• Diameter:
  Between 1.391 inches and 1.397 inches
• Axial Thickness:
  Between 0.206 inches and 0.226 inches
• Equivalent Focal Length:
  4.045 inches
• Back Focal Length:
  3.902 inches
• Refraction Index:
  1.5110
• Abbe Constant:
  63.500
• Single Lens Style:
  Plano-convex
• Element Left Surface Radius:
  2.067 inches
• Element Right Surface Radius:
  2.067 inches
• Material:
  Glass, optical, mil-g-174, class 1, grade c, type 511-635
• Fsc Application Data:
  Periscope, tank
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-768-8729
• Special Features:
  Chamfer edges 0.010 in. Min, 0.020 in. Max. By 45 deg. Front and back surfaces coated with magnesium fluoride.